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236e2491b4
The `cluster.routing.allocation.balance.primary` setting has caused a lot of confusion in the past while it has very little benefit form a shard allocatioon point of view. Users tend to modify this value to evently distribute primaries across the nodes which is dangerous since a prmiary flag on it's own can trigger relocations. The primary flag for a shard is should not have any impact on cluster performance unless the high level feature suffereing from primary hotspots is buggy. Yet, this setting was intended to be a tie-breaker which is not necessary anymore since the algorithm is deterministic. This commit removes this setting entriely.